Long-period magnetic activity in the K dwarf GJ1137 and a new super-Earth on a 9-day orbit - A cautionary tale for Jovian-analogue detection from Doppler surveys

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Volume 708 (April 2026)

A&A, 708 (2026) A232

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Table A.2

Parameter posteriors of our best model that included only an LTF and GJ 1137 b.

Parameter name	Symbol	Unit	Prior	Posterior
LTF parameters
Period	P_cyc	d	U_log (10³, 10⁴)	$5320_{- 150}^{+ 170}$ $Mathematical equation: $5320^{+170}_{-150}$$
RV phase	ϕ_{cyc, 0}	−	U(0, 1)^w	0.894 ± 0.020
RV semi-amplitude	k_{cyc, 0}	m s⁻¹	U(0, 40)	14.2 ± 0.6
FWHM phase	ϕ_{cyc, 1}	−	U(0, 1)^w	${0.888}_{- 0.022}^{+ 0.021}$ $Mathematical equation: $0.888^{+0.021}_{-0.022}$$
FWHM semi-amplitude	k_{cyc, 1}	m s⁻¹	U(0, 40)	${18.7}_{- 1.7}^{+ 1.8}$ $Mathematical equation: $18.7^{+1.8}_{-1.7}$$
R′_HK phase	ϕ_{cyc, 2}	−	U(0, 1)^w	${0.797}_{- 0.020}^{+ 0.021}$ $Mathematical equation: $0.797^{+0.021}_{-0.020}$$
R′_HK semi-amplitude	k_{cyc, 2}	ppm	U(0, 10)	${6.59}_{- 0.79}^{+ 0.89}$ $Mathematical equation: $6.59^{+0.89}_{-0.79}$$
RV zero-order correction	α_0,0	m s⁻¹	N(μ_lm,200σ_lm)	$- {3.64}_{- 0.60}^{+ 0.57}$ $Mathematical equation: $-3.64^{+0.57}_{-0.60}$$
FWHM zero-order correction	α_0,1	m s⁻¹	N(μ_lm,200σ_lm)	$- {5.86}_{- 1.57}^{+ 1.53}$ $Mathematical equation: $-5.86^{+1.53}_{-1.57}$$
R′_HK second-order correction	α_2,2	ppm d⁻²	N(μ_lm,200σ_lm)	$({1.10}_{- 0.27}^{+ 0.28}) \times 10^{- 6}$ $Mathematical equation: $(1.10^{+0.28}_{-0.27})\times 10^{-6}$$
R′_HK first-order correction	α_1,2	ppm d⁻¹	N(μ_lm,200σ_lm)	$({6.60}_{- 1.41}^{+ 1.49}) \times 10^{- 3}$ $Mathematical equation: $(6.60^{+1.49}_{-1.41})\times 10^{-3}$$
R′_HK zero-order correction	α_0,2	ppm	N(μ_lm,200σ_lm)	${7.19}_{- 1.31}^{+ 1.33}$ $Mathematical equation: $7.19^{+1.33}_{-1.31}$$
HARPS-pre FWHM linear drift	β	m s⁻¹ d⁻¹	U(−0.1,0.1)	${0.0127}_{- (16)}^{+ (17)}$ $Mathematical equation: $0.0127^{+(17)}_{-(16)}$$
Dataset parameters
HARPS-post RV offset	O_1,0	m s⁻¹	N(0,5σ₀)	${9.78}_{- 1.86}^{+ 1.84}$ $Mathematical equation: $9.78^{+1.84}_{-1.86}$$
HARPS-post FWHM offset	O_1,1}	m s⁻¹	N(0,5σ₁)	${20.1}_{- 2.8}^{+ 3.0}$ $Mathematical equation: $20.1^{+3.0}_{-2.8}$$
HARPS-post R′_HK offset	O_1,2	ppm	N(0,5σ₂)	0.35 ± 0.71
HARPS-pre RV jitter	J_0,0	m s⁻¹	U_log(10⁻³, 10³)	${3.03}_{- 0.24}^{+ 0.29}$ $Mathematical equation: $3.03^{+0.29}_{-0.24}$$
HARPS-post RV jitter	J_1,0	m s⁻¹	U_log(10⁻³, 10³)	${2.17}_{- 0.24}^{+ 0.28}$ $Mathematical equation: $2.17^{+0.28}_{-0.24}$$
HARPS-pre FWHM jitter	J_0,1	m s⁻¹	U_log(10⁻³, 10³)	${6.94}_{- 0.66}^{+ 0.73}$ $Mathematical equation: $6.94^{+0.73}_{-0.66}$$
HARPS-post FWHM jitter	J_1,1	m s⁻¹	U_log(10⁻³, 10³)	${0.22}_{- 0.22}^{+ 2.26}$ $Mathematical equation: $0.22^{+2.26}_{-0.22}$$
HARPS-pre R′_HK jitter	J_0,2	ppm	U_log(10⁻², 10³)	${1.12}_{- 0.10}^{+ 0.11}$ $Mathematical equation: $1.12^{+0.11}_{-0.10}$$
HARPS-post R′_HK jitter	J_1,2	ppm	U_log(10⁻², 10³)	${0.90}_{- 0.11}^{+ 0.12}$ $Mathematical equation: $0.90^{+0.12}_{-0.11}$$
GJ 1137 b
Period	P_b	d	U(140, 150)	144.751 ± 0.030
Phase	ϕ_b	−	U(0, 1)^w	${0.704}_{- 0.06}^{+ 0.07}$ $Mathematical equation: $0.704^{+0.07}_{-0.06}$$
RV semi-amplitude	k_{rv, b}	m s⁻¹	U(0, 30)	20.0 ± 0.4
Eccentricity	e_b	−	U(0, 1)	${0.105}_{- 0.017}^{+ 0.016}$ $Mathematical equation: $0.105^{+0.016}_{-0.017}$$
Argument of periastron	ω_b	−	U(0, 2π)^w	${6.08}_{- 0.18}^{+ 0.20}$ $Mathematical equation: $6.08^{+0.20}_{-0.18}$$

Notes. ^(w)Wrapped parameter. Reported uncertainties reflect the 16^th and the 84^th percentiles. The standard deviation of measurements in physical quantity j is denoted σ_j.

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